Re: [EnergyPlus_Support] Gas heating and evaporative cooling on a single air loop - possible or not?

[Fred Buhl <wfbuhl@xxxxxxx>]

This is definitely strictly a control issue. I don't think any of the 
standard managers
are going to work for you. My hunch is that you would be able to do this 
using
the EMS capability.

Fred Buhl

On 4/27/2010 6:23 PM, rowan.blakers wrote:
> Hello,
>
> I am trying to model a building that is conditioned with units that
> include a gas heating coil and an evaporative cooler. A fan provides
> airflow, and dampers control the proportions of outside, return and
> relief air.
>
> In cooling, maximum supply air flow is provided (~3000L/s), comprised
> entirely of OA. The evaporative cooler provides cooling.
>
> In heating, the total supply airflow is halved (~1500L/s), and OA is
> reduced to a minimum (~850L/s). The balance is made up from return air
> (~650L/s). Heating is via the gas heating coil.
>
> Is it possible to model this system using a single AirLoopHVAC system?
>
> Previously when I have modelled evaporative coolers I have controlled
> them by using AvailabilityManager:HighTemperatureTurnOn and
> AvailabilityManager:LowTemperatureTurnOff objects to turn the entire
> system on/off based on zone temperature. This will not work if there is
> a heating coil on the same loop - the AvailabilityManagers will turn the
> system off at same time that heating is required. So is there an
> alternative control method for the evaporative cooler? Or do I need to
> create two sepparate AirLoopHVAC systems - one for heating and one for
> cooling?
>
> If anyone has an alternative solution to this I would be interested in
> hearing it.
>
> Thankyou.
>
>
>
>
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